<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/9/15
 * Time: 15:20
 */
$a = 3;
$b = 4;
//
//$a = 4;
//$b = 3;

$t = $a;
$a = $b;
$b = $t;

var_dump($a);
var_dump($b);